Revise Code of Conduct to GEMC Community standards

Author: maureeungaro

CODE_OF_CONDUCT.md

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+# GEMC Community Code of Conduct
+
+## Our Pledge
+We, as members, contributors, and maintainers of GEMC, pledge to make participation 
+in our project and community a harassment-free experience for everyone, regardless of 
+age, body size, visible or invisible disability, ethnicity, experience level, 
+education, gender identity and expression, level of experience, nationality, personal 
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+Examples of behavior that contributes to a positive environment include:
+- Being respectful of differing viewpoints and experiences
+- Giving and gracefully accepting constructive feedback
+- Focusing on what is best for the community
+- Showing empathy and kindness to other community members
+
+Examples of unacceptable behavior include:
+- Harassment, intimidation, or discrimination
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Sexualized language or imagery
+- Public or private harassment, or publishing others’ private information
+- Sustained disruption of discussions or reviews
+- Spam or advertising unrelated to the project
+
+## Enforcement Responsibilities
+Project maintainers are responsible for clarifying and enforcing standards of acceptable 
+behavior and may take appropriate and fair corrective action in response to any behavior 
+they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+This Code of Conduct applies within all project spaces and also applies when an 
+individual is representing the project in public spaces.
+
+## Reporting
+If you experience or witness unacceptable behavior, report it to **gemc@jlab.org**. 
+Reports will be reviewed and handled confidentially to the extent possible. 
+If the incident involves a maintainer, the project will bring in an uninvolved reviewer.
+
+## Enforcement
+All complaints will be reviewed and investigated promptly and fairly. 
+Maintainers are obligated to respect the privacy and security of the reporter of any incident.
+
+### Enforcement Guidelines
+- **Correction** — For minor, one-off issues. Consequence: private or public clarification of expectations.
+- **Warning** — For a single significant incident or repeated minor issues. Consequence: written warning and expectations for change.
+- **Temporary Restriction** — For repeated violations. Consequence: temporary removal from interactions (issues, PRs, etc.).
+- **Permanent Ban** — For severe or repeated violations. Consequence: permanent removal from community spaces.
+
+## Attribution
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1.